Looks like Musa ornata to me.

Do any of You Banana growers know of a strictly botanical identification key for the genera of Bananas? I have inherited two healthy plants that grew like crazy this summer,but neither has been identified nor have they flowered to date.However if they survive the winter under my residence, I will expect flowers in the summer of 2012 since the plants are almost 2.8 meters tall Any information that might be offered will be VERY greatly appreciated.

Without blooms / fruit its going to be very hard if not impossible to identify unless there is a very strong characteristic that it has. Do you have any photos?